However, pushing against these arguments, it remains true that there is no evident interpretation of exactly what the path integral mathematics is implying about the underlying system. Some efforts to realistically interpret this mathematics indeed look retrocausal [1]}. But alternatively one might stress that different histories are being combined into the same probability calculation, and then conclude that the path integral was supporting a many-worlds-type picture, with a different sort of “nonlocal” interaction between histories/worlds.
